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However, what follows applies to acute subdural hematomas in children only.
Subdural hematomas usually occur because veins on the inside of the dura that connect the brain cortex and the venous sinuses (bridging veins) are ruptured as the result of a blow to the head.
Subdural hematomas in children and adolescents are usually abrupt onset or acute and are brought about by accident or injury.
With small subdural hematomas, the blood may slowly be reabsorbed over several weeks without much damage.
Larger hematomas, however, can gradually get bigger even though the bleeding has stopped.